<h3>
Answer:</h3>
A.
+-5x+14x+-35
+9x-35
B. 

C. 

D. 


Step-by-step explanation:
A. (3x*2x)+(3x*-5)+(7*2x)+(7*-5)
Multiply and simplify.
+9x-35
B. (
)+(
-3x)+(2x
)+(2x
)
Multiply and simplify.

C. 
Multiply and simplify.

D. 
Multiply and simplify.

I hope this helps!
But you should really do this yourself.
Answer:
Your answer is going to be x=4.
Step-by-step explanation:
5x+1=21
-1 -1
(5x)/5=(20)/5
x=4
D because of the front of the plane and the back of the plane
Answer:
Option D. tan 225° is the correct answer.
Step-by-step explanation:
As we know 
Given in the question angle A = 112.5°
Hence the formula becomes as

Therefore its a formula of tan2(112.5) = tan 225°
Option D. is the correct answer.